user login from database

[glo]

Can vBulletin only allow members to post if they are part of the existing membership. Ie you basically stop new members from joining, hence removal of the "registration / create a new username " link. So that posting is only done by exisiting members?

[Semperfidelis]

Yes you can
Its an option in the Admin CP to turn new users on or off

Have a play around with the admin demo to see the features of the Admin CP.